merge: make collect_parents() auto-generate the merge message

Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin/merge.c b/builtin/merge.c
index a972ed6422f3de693f217ef7169ced924fd19402..9f9853876bb3345a1d7e9746c35f13ffbf06498f 100644 (file)
--- a/builtin/merge.c
+++ b/builtin/merge.c
@@ -1092,7 +1092,8 @@ static void prepare_merge_message(struct strbuf *merge_names, struct strbuf *mer
 
 static struct commit_list *collect_parents(struct commit *head_commit,
                                           int *head_subsumed,
-                                          int argc, const char **argv)
+                                          int argc, const char **argv,
+                                          struct strbuf *merge_msg)
 {
        int i;
        struct commit_list *remoteheads = NULL;
@@ -1108,7 +1109,20 @@ static struct commit_list *collect_parents(struct commit *head_commit,
                remotes = &commit_list_insert(commit, remotes)->next;
        }
 
-       return reduce_parents(head_commit, head_subsumed, remoteheads);
+       remoteheads = reduce_parents(head_commit, head_subsumed, remoteheads);
+
+       if (merge_msg &&
+           (!have_message || shortlog_len)) {
+               struct strbuf merge_names = STRBUF_INIT;
+               struct commit_list *p;
+
+               for (p = remoteheads; p; p = p->next)
+                       merge_name(merge_remote_util(p->item)->name, &merge_names);
+               prepare_merge_message(&merge_names, merge_msg);
+               strbuf_release(&merge_names);
+       }
+
+       return remoteheads;
 }
 
 int cmd_merge(int argc, const char **argv, const char *prefix)
@@ -1222,7 +1236,8 @@ int cmd_merge(int argc, const char **argv, const char *prefix)
                if (fast_forward == FF_NO)
                        die(_("Non-fast-forward commit does not make sense into "
                            "an empty head"));
-               remoteheads = collect_parents(head_commit, &head_subsumed, argc, argv);
+               remoteheads = collect_parents(head_commit, &head_subsumed,
+                                             argc, argv, NULL);
                remote_head = remoteheads->item;
                if (!remote_head)
                        die(_("%s - not something we can merge"), argv[0]);
@@ -1248,7 +1263,8 @@ int cmd_merge(int argc, const char **argv, const char *prefix)
                head_arg = argv[1];
                argv += 2;
                argc -= 2;
-               remoteheads = collect_parents(head_commit, &head_subsumed, argc, argv);
+               remoteheads = collect_parents(head_commit, &head_subsumed,
+                                             argc, argv, NULL);
        } else {
                /* We are invoked directly as the first-class UI. */
                head_arg = "HEAD";
@@ -1258,16 +1274,8 @@ int cmd_merge(int argc, const char **argv, const char *prefix)
                 * the standard merge summary message to be appended
                 * to the given message.
                 */
-               remoteheads = collect_parents(head_commit, &head_subsumed, argc, argv);
-
-               if (!have_message || shortlog_len) {
-                       struct strbuf merge_names = STRBUF_INIT;
-
-                       for (p = remoteheads; p; p = p->next)
-                               merge_name(merge_remote_util(p->item)->name, &merge_names);
-                       prepare_merge_message(&merge_names, &merge_msg);
-                       strbuf_release(&merge_names);
-               }
+               remoteheads = collect_parents(head_commit, &head_subsumed,
+                                             argc, argv, &merge_msg);
        }
 
        if (!head_commit || !argc)